US20030097183A1 - Shoulder joint prosthesis - Google Patents
Shoulder joint prosthesis Download PDFInfo
- Publication number
- US20030097183A1 US20030097183A1 US10/287,289 US28728902A US2003097183A1 US 20030097183 A1 US20030097183 A1 US 20030097183A1 US 28728902 A US28728902 A US 28728902A US 2003097183 A1 US2003097183 A1 US 2003097183A1
- Authority
- US
- United States
- Prior art keywords
- accordance
- shoulder joint
- joint prosthesis
- conical
- conical body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/40—Joints for shoulders
- A61F2/4014—Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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Definitions
- the invention relates to a shoulder joint prosthesis having two bearing bodies which slide on one another and which can be respectively connected to the upper arm by a shaft and to the shoulder bone by a platform.
- a prosthesis of this kind is shown in the patent application WO 97/25943.
- a bearing body connectable to a shaft in the upper arm has, at its lower side, a projecting cone with a circular cross-section and index bores for a pin projecting out of the shaft to fix the bearing body with its circular cone in different angular positions.
- the index bores and the projecting pin must have a minimum clearance relative to one another so that the cone and the counter surface reliably form a connection. Due to this clearance, torsional forces are also transmitted at the connection which can only be transmitted by the static friction and which occur in addition to the axial loads at the friction points.
- Such a frictional connection is more at risk as a connection by the additionally occurring shear stresses through torsional loading, with a spread of the transmittable forces already arising from the blow by which a press-fit has to be produced and from the condition at the cone surfaces.
- connection to the shaft is brought about by a non-rotationally symmetrical, conical body with a self-locking seat, with its periphery being form matched to a mating shape in the shaft ( 5 ) which is rotationally fixed relative to a longitudinal axis and keyed by the amount of taper so that the connection is releasable and repeatedly fixable in the same angular position.
- Such an arrangement has the advantage that components of normal forces are already present relative to the longitudinal axis of the connection in both directions of rotation due to the strain in the state of rest and, with a torsional stress, can act in opposition in accordance with the distance of their line of action from the axis of rotation.
- a further advantage consists in the fact that contact points can be deliberately chosen through the deviation from the circular cross-section of the cone connection which do not undergo any dilation at the outer conical sleeve dependent only on the ring tension and the elasticity of the material, but rather produce an additional bending load at the sleeve, which corresponds to a softer spring effect of the sleeve and thus produces a greater pushing on path and more reliability for an achieved holding force.
- the strength of the conical connection which is repeatedly detachable, also allows a conical body with a spherical cup to be attached to an already implanted shaft in a modification with respect to the natural shoulder joint, the spherical cup being pivotally mounted on a spherical head attached to the platform. This reversal of the joint, which allows less sliding and mainly a pivoting about the centre of the ball, is necessary when the ligaments are seriously damaged.
- the strength of the conical connection also allows more complex applications to be included such as are shown in the patent application FR 94 14962 A1.
- embodiments are shown with a shaft which ends as a longitudinally slit ball with a conical bore in order to fix the ball in a spherical recess of the bearing head via a conical pressure body. Since this ball is moulded onto the conical body of the present invention and this also receives an adjusting screw and the conical pressure body, the shaft can be initially implanted, then the best angular position of the bearing head can be fixed with a manipulating prosthesis placed on as a conical body and the same angular position can be set at a bearing head of the same size independent of the already implanted shaft. Such an angular position can additionally be secured by a pin projecting from the conical body and engaging in a matching bore in the spherical mount of the bearing head.
- a further possibility for the fixing of the spherical joint in the bearing body consists of an oppositely slit spherical body with a conical bore which can be placed onto an additional circular cone which is formed on the conical body and which can be fixed in the bearing body by a blow on the mounted bearing body and can be retained by self-locking by friction at the conical body.
- a further improvement of the conical connection between the conical body and the mating shape in the shaft is achieved when the contact points are distributed in two planes standing transversely to the longitudinal axis and when the two planes have a pre-set minimum distance from one another. This is achieved, for example, by an interruption of the engagement surface in the central region of the conical body.
- FIG. 1 schematically, a shaft implanted in the humerus
- FIG. 2 schematically, an artificial shoulder joint with a bearing head which has a conical body matching the shaft of FIG. 1;
- FIG. 3 schematically, a cross-section through a conical body in accordance with FIG. 2 with an elliptically extending periphery;
- FIG. 4 schematically, a cross-section through a conical body in accordance with FIG. 2 in which the periphery corresponds to a body having an outline formed by three curves and of constant diameter;
- FIG. 5 schematically, in section, a bearing body which can be connected via a fixable spherical joint to a conical body in accordance with FIG. 2 by a blow;
- FIG. 6 schematically, a view of a spherical body and the conical body of FIG. 5;
- FIG. 7 schematically, in section, a bearing body in which a spherical joint can be fixed between the bearing body and a conical body by a screw extending in the axial direction of the conical body;
- FIG. 8 schematically, a shaft implanted in a humerus with a mating shape for a conical body
- FIG. 9 schematically, a conical body which matches the shaft of FIG. 8 and which, with a spherical cup, forms an artificial shoulder joint to a spherical head which is secured via a platform to the shoulder bone;
- FIG. 10 schematically, a section of FIG. 7 with a pressure body which has a pin-shaped projection for an additional securing in the bearing body;
- FIG. 11 schematically, a trial bearing head for an arrangement in accordance with FIG. 7;
- FIG. 12 schematically, a section in accordance with FIG. 3, at which a rotationally fixed keying is shown between the conical body and the mating shape;
- FIG. 13 schematically, a section through a conical body with an originally rectangular cross-section at the subsequently conical part areas which were made elliptical in section and matched to a mating shape in accordance with FIG. 12;
- FIG. 14 schematically, a conical body in accordance with FIG. 6, in which an interruption is worked into the central region of the conical area.
- FIGS. 1 and 2 A first embodiment is shown in FIGS. 1 and 2.
- a shaft 5 is implanted in a humerus 3 , with the shaft 5 being anchored directly in a prepared bone bed.
- the shaft can, however, equally well be a shaft anchored in the humerus with bone cement.
- a bore 16 is provided in the direction of a longitudinal axis 9 for the actual shoulder joint and ends in a mating shape 15 for a conical body 7 .
- the actual joint is formed by a bearing head 1 rigidly connected to the conical body 7 and by a bearing shell 2 which is in turn rigidly connected to a platform 6 anchored in the shoulder bone 4 .
- Spigots 14 are provided parallel to one another at the platform 6 to anchor the platform 6 and are anchored in prepared bores of the shoulder bone 4 , for example, with bone cement or by a press fit.
- the conical body 7 and, accordingly, the mating shape 15 have a cross-section 10 with a periphery 8 which, in accordance with FIG. 3, is elliptical in shape.
- a cross-section derived from an equilateral triangle is shown in FIG. 4 which corresponds to a body having an outline formed by three curves and of constant diameter 13 , a shape which is used as a connection between two shafts in mechanical engineering.
- FIG. 12 The relationships aimed at for an approximately elliptical cross-section are shown in FIG. 12.
- Four contact points P which expand to form contact areas on intensive pressing, are provided by slight deviations in shape between the conical body 7 and the mating shape 15 .
- a radial spacing 39 of a contact point P is selected such that the line of action of a pressure load N passes the longitudinal axis 9 at a relatively large spacing 36 to transmit components of a torque M as changes of normal forces.
- a torque M additionally engaging at the conic body 7 is thus compensated by reduction in the pre-stress or respectively by an increase of the pre-stress N by a fraction AN.
- the pre-stressed local shape match is thus decisive.
- the same situation is shown more extremely in FIG. 13.
- the conical body 7 is now only in contact with the elliptical base shape 15 in the region of the contact point expanded to form contact areas. The remaining areas are set back.
- FIG. 14 A further possibility for the modification of the conical body 7 is shown in FIG. 14. To be able to transmit the largest possible bending moments in the longitudinal axis 9 , the tensioning takes place in two cross-sections which lie apart by a minimum spacing 37 . This means that the cone has an interruption 38 of this minimum spacing 37 in the central region.
- the rigid connection between the conical body 7 and the bearing head 1 are realised by a fixable ball joint.
- the bearing head has a spherical recess 19 which includes an angle of more than 180° in the longitudinal section.
- a compressible spherical body 18 can be inserted into this recess 19 .
- Said body is compressible because it has a continuous inner bore and slits 21 which are provided at alternate sides and which leave narrow bridges 20 standing at the end faces. Since the inner bore is designed as a circular cone, the spherical body 18 can be spread apart by a matching circular cone 17 formed on the conical body 7 .
- the cone angle of this circle cone 17 is selected to be self locking, which has the result that, after a blow onto the bearing head 1 or onto the conical body 7 in the direction of the longitudinal axis 9 , the bearing head 1 is fixed relative to the spherical body 18 and the spherical body 18 is fixed relative to the conical body 7 .
- FIG. 7 A further example for a fixable ball joint between the bearing head 1 and the conical body 7 is shown in FIG. 7.
- a neck 22 and a ball 23 are formed on the conical body 7 .
- the ball 23 has a conical bore 24 and elongate slits which extend from the apex up to and into the neck 22 so that the neck 22 is divided into a plurality of bending elements. As long as the conical bore 24 is empty, the ball 23 can be compressed and inserted into the spherical recess 19 of the bearing head 1 .
- a conical body 7 a and a trial bearing head 33 which have the same construction externally, are inserted in the shaft 5 (FIGS. 1 and 2) to find an optimum position for the trial bearing head 33 .
- the conical body 7 a has a rigid ball head 35 on which grub screws 34 engage to fix the trial bearing head 33 in its optimum position. Subsequently, the conical body 7 a and the trial bearing head 33 are released from the shaft 5 to copy the position of the trial bearing head 33 relative to the conical body 7 a on the final conical body 7 and its bearing head 1 (FIG. 7) outside the operating field.
- FIGS. 8 and 9 the functions of the ball and the bearing shell are exchanged, in order to allow the upper arm to rotate about a point of rotation.
- the shaft 5 implanted in the upper arm 3 is in turn provided with a bore 16 and a mating shape 15 for a conical body 7 .
- the conical body 7 is, however, broadened to form a mount for a ball shell 12 which in turn partly surrounds a ball head 11 .
- the ball head is secured to a platform 6 , which is anchored in the shoulder bone 4 via spigots 14 , by a snap connection or screw connection (neither being shown here).
- the anchoring of the platform 6 can equally take place via bone screws and projecting ribs in the shoulder bone.
- FIG. 14 a conical body 7 is shown in which the carrying conical part has an interruption 38 .
- two conical regions are formed for the clamping to form a mating shape 15 (not shown), with these regions being spaced apart by a minimum spacing 37 in order to be able to transmit bending moments in the longitudinal axis 9 .
Abstract
Description
- The invention relates to a shoulder joint prosthesis having two bearing bodies which slide on one another and which can be respectively connected to the upper arm by a shaft and to the shoulder bone by a platform.
- A prosthesis of this kind is shown in the patent application WO 97/25943. A bearing body connectable to a shaft in the upper arm has, at its lower side, a projecting cone with a circular cross-section and index bores for a pin projecting out of the shaft to fix the bearing body with its circular cone in different angular positions. With this arrangement, the index bores and the projecting pin must have a minimum clearance relative to one another so that the cone and the counter surface reliably form a connection. Due to this clearance, torsional forces are also transmitted at the connection which can only be transmitted by the static friction and which occur in addition to the axial loads at the friction points. Such a frictional connection is more at risk as a connection by the additionally occurring shear stresses through torsional loading, with a spread of the transmittable forces already arising from the blow by which a press-fit has to be produced and from the condition at the cone surfaces.
- It is therefore the object of the present invention to provide a better connection for an attachment to the shaft of a shoulder joint prosthesis. This object is satisfied by the characterising features of
independent claim 1 in that the connection to the shaft is brought about by a non-rotationally symmetrical, conical body with a self-locking seat, with its periphery being form matched to a mating shape in the shaft (5) which is rotationally fixed relative to a longitudinal axis and keyed by the amount of taper so that the connection is releasable and repeatedly fixable in the same angular position. - Such an arrangement has the advantage that components of normal forces are already present relative to the longitudinal axis of the connection in both directions of rotation due to the strain in the state of rest and, with a torsional stress, can act in opposition in accordance with the distance of their line of action from the axis of rotation. A further advantage consists in the fact that contact points can be deliberately chosen through the deviation from the circular cross-section of the cone connection which do not undergo any dilation at the outer conical sleeve dependent only on the ring tension and the elasticity of the material, but rather produce an additional bending load at the sleeve, which corresponds to a softer spring effect of the sleeve and thus produces a greater pushing on path and more reliability for an achieved holding force.
- Further advantageous further developments of the invention result from the
dependent claims 2 to 11. Thus, it is advantageous, with an elliptical periphery of the conical body, to select the desired contact points such that their radial distance from the longitudinal axis lies between the magnitude of the major and minor semi-axes of the ellipse, but closer to that of the major semi-axis. The situation is similar with a body having an outline formed by three curves and of constant diameter in which the contact points should lie with their radial distance to the longitudinal axis between the magnitude of the smallest and the largest arch spacing, but closer to that of the largest arch spacing. Generally contact points are good in which the line of action of the normal force has a large perpendicular distance from the longitudinal axis. - The strength of the conical connection, which is repeatedly detachable, also allows a conical body with a spherical cup to be attached to an already implanted shaft in a modification with respect to the natural shoulder joint, the spherical cup being pivotally mounted on a spherical head attached to the platform. This reversal of the joint, which allows less sliding and mainly a pivoting about the centre of the ball, is necessary when the ligaments are seriously damaged. The strength of the conical connection also allows more complex applications to be included such as are shown in the patent application FR 94 14962 A1. In this publication, embodiments are shown with a shaft which ends as a longitudinally slit ball with a conical bore in order to fix the ball in a spherical recess of the bearing head via a conical pressure body. Since this ball is moulded onto the conical body of the present invention and this also receives an adjusting screw and the conical pressure body, the shaft can be initially implanted, then the best angular position of the bearing head can be fixed with a manipulating prosthesis placed on as a conical body and the same angular position can be set at a bearing head of the same size independent of the already implanted shaft. Such an angular position can additionally be secured by a pin projecting from the conical body and engaging in a matching bore in the spherical mount of the bearing head.
- A further possibility for the fixing of the spherical joint in the bearing body consists of an oppositely slit spherical body with a conical bore which can be placed onto an additional circular cone which is formed on the conical body and which can be fixed in the bearing body by a blow on the mounted bearing body and can be retained by self-locking by friction at the conical body.
- A further improvement of the conical connection between the conical body and the mating shape in the shaft is achieved when the contact points are distributed in two planes standing transversely to the longitudinal axis and when the two planes have a pre-set minimum distance from one another. This is achieved, for example, by an interruption of the engagement surface in the central region of the conical body.
- The invention will be described in the following with reference to embodiments. There are shown:
- FIG. 1: schematically, a shaft implanted in the humerus;
- FIG. 2: schematically, an artificial shoulder joint with a bearing head which has a conical body matching the shaft of FIG. 1;
- FIG. 3: schematically, a cross-section through a conical body in accordance with FIG. 2 with an elliptically extending periphery;
- FIG. 4: schematically, a cross-section through a conical body in accordance with FIG. 2 in which the periphery corresponds to a body having an outline formed by three curves and of constant diameter;
- FIG. 5: schematically, in section, a bearing body which can be connected via a fixable spherical joint to a conical body in accordance with FIG. 2 by a blow;
- FIG. 6: schematically, a view of a spherical body and the conical body of FIG. 5;
- FIG. 7: schematically, in section, a bearing body in which a spherical joint can be fixed between the bearing body and a conical body by a screw extending in the axial direction of the conical body;
- FIG. 8: schematically, a shaft implanted in a humerus with a mating shape for a conical body;
- FIG. 9: schematically, a conical body which matches the shaft of FIG. 8 and which, with a spherical cup, forms an artificial shoulder joint to a spherical head which is secured via a platform to the shoulder bone;
- FIG. 10: schematically, a section of FIG. 7 with a pressure body which has a pin-shaped projection for an additional securing in the bearing body;
- FIG. 11: schematically, a trial bearing head for an arrangement in accordance with FIG. 7;
- FIG. 12: schematically, a section in accordance with FIG. 3, at which a rotationally fixed keying is shown between the conical body and the mating shape;
- FIG. 13: schematically, a section through a conical body with an originally rectangular cross-section at the subsequently conical part areas which were made elliptical in section and matched to a mating shape in accordance with FIG. 12; and
- FIG. 14: schematically, a conical body in accordance with FIG. 6, in which an interruption is worked into the central region of the conical area.
- In the following embodiments, the same reference symbols are used for the same functions.
- A first embodiment is shown in FIGS. 1 and 2. A
shaft 5 is implanted in ahumerus 3, with theshaft 5 being anchored directly in a prepared bone bed. The shaft can, however, equally well be a shaft anchored in the humerus with bone cement. Abore 16 is provided in the direction of alongitudinal axis 9 for the actual shoulder joint and ends in amating shape 15 for aconical body 7. The actual joint is formed by abearing head 1 rigidly connected to theconical body 7 and by abearing shell 2 which is in turn rigidly connected to aplatform 6 anchored in theshoulder bone 4.Spigots 14 are provided parallel to one another at theplatform 6 to anchor theplatform 6 and are anchored in prepared bores of theshoulder bone 4, for example, with bone cement or by a press fit. - The
conical body 7 and, accordingly, themating shape 15 have a cross-section 10 with aperiphery 8 which, in accordance with FIG. 3, is elliptical in shape. A cross-section derived from an equilateral triangle is shown in FIG. 4 which corresponds to a body having an outline formed by three curves and ofconstant diameter 13, a shape which is used as a connection between two shafts in mechanical engineering. - The relationships aimed at for an approximately elliptical cross-section are shown in FIG. 12. Four contact points P, which expand to form contact areas on intensive pressing, are provided by slight deviations in shape between the
conical body 7 and themating shape 15. Aradial spacing 39 of a contact point P is selected such that the line of action of a pressure load N passes thelongitudinal axis 9 at a relativelylarge spacing 36 to transmit components of a torque M as changes of normal forces. A torque M additionally engaging at theconic body 7 is thus compensated by reduction in the pre-stress or respectively by an increase of the pre-stress N by a fraction AN. The pre-stressed local shape match is thus decisive. The same situation is shown more extremely in FIG. 13. Theconical body 7 is now only in contact with theelliptical base shape 15 in the region of the contact point expanded to form contact areas. The remaining areas are set back. - A further possibility for the modification of the
conical body 7 is shown in FIG. 14. To be able to transmit the largest possible bending moments in thelongitudinal axis 9, the tensioning takes place in two cross-sections which lie apart by aminimum spacing 37. This means that the cone has aninterruption 38 of thisminimum spacing 37 in the central region. - With a body having an outline formed by three curves and of constant diameter, such as is shown in FIG. 4, more than three contact points are likewise aimed at within the frame of the production tolerances, with the lines of action of the normal forces of some contact points being likewise intended to lie at a distance from the
longitudinal axis 9. - In the example of FIGS. 5 and 6, the rigid connection between the
conical body 7 and thebearing head 1 are realised by a fixable ball joint. The bearing head has aspherical recess 19 which includes an angle of more than 180° in the longitudinal section. A compressiblespherical body 18 can be inserted into thisrecess 19. Said body is compressible because it has a continuous inner bore andslits 21 which are provided at alternate sides and which leavenarrow bridges 20 standing at the end faces. Since the inner bore is designed as a circular cone, thespherical body 18 can be spread apart by a matchingcircular cone 17 formed on theconical body 7. The cone angle of thiscircle cone 17 is selected to be self locking, which has the result that, after a blow onto the bearinghead 1 or onto theconical body 7 in the direction of thelongitudinal axis 9, the bearinghead 1 is fixed relative to thespherical body 18 and thespherical body 18 is fixed relative to theconical body 7. - A further example for a fixable ball joint between the bearing
head 1 and theconical body 7 is shown in FIG. 7. Aneck 22 and aball 23 are formed on theconical body 7. Theball 23 has aconical bore 24 and elongate slits which extend from the apex up to and into theneck 22 so that theneck 22 is divided into a plurality of bending elements. As long as the conical bore 24 is empty, theball 23 can be compressed and inserted into thespherical recess 19 of the bearinghead 1. Only when aconical pressure body 25 is inserted through a tapped bore 29 in theconical body 7 and is driven forward by ascrew 27, can the segments of theball 23 separated byelongate slits 26 be spread apart, with the neck area forming a kind of flexural spring and yielding joint. Instead of thescrew 27, a ram can also be inserted to fix theconical pressure body 25 by a blow to the ram. Thescrew 27 is a grub screw provided with ahexagonal socket 28 arid drives theconical pressure body 25 forwards with anose 30. Since plastic deformations can also occur due to the short dimensions in the neck region, only a one-time setting procedure is provided. For this purpose, in accordance with FIG. 11, a conical body 7 a and atrial bearing head 33, which have the same construction externally, are inserted in the shaft 5 (FIGS. 1 and 2) to find an optimum position for thetrial bearing head 33. The conical body 7 a has arigid ball head 35 on which grub screws 34 engage to fix thetrial bearing head 33 in its optimum position. Subsequently, the conical body 7 a and thetrial bearing head 33 are released from theshaft 5 to copy the position of thetrial bearing head 33 relative to the conical body 7 a on the finalconical body 7 and its bearing head 1 (FIG. 7) outside the operating field. A way of realising a copying procedure of this kind for achieving the same relative position can appear is shown in the patent application EP-A-0 931 522; however, only theconical body 7, 7 a releasable from the shaft has to be clamped in the same apparatus. In accordance with FIG. 10, in the optimum position, arecess 32 can be provided in thespherical recess 19 of the bearing head into which a pin-shapedprojection 31 of theconical pressure body 2 projects as an additional security against rotation. - In the example of FIGS. 8 and 9, the functions of the ball and the bearing shell are exchanged, in order to allow the upper arm to rotate about a point of rotation. The
shaft 5 implanted in theupper arm 3 is in turn provided with abore 16 and amating shape 15 for aconical body 7. Theconical body 7 is, however, broadened to form a mount for aball shell 12 which in turn partly surrounds aball head 11. The ball head is secured to aplatform 6, which is anchored in theshoulder bone 4 viaspigots 14, by a snap connection or screw connection (neither being shown here). The anchoring of theplatform 6 can equally take place via bone screws and projecting ribs in the shoulder bone. - In FIG. 14, a
conical body 7 is shown in which the carrying conical part has aninterruption 38. In this way, two conical regions are formed for the clamping to form a mating shape 15 (not shown), with these regions being spaced apart by aminimum spacing 37 in order to be able to transmit bending moments in thelongitudinal axis 9. - Calculations of strength and practical trials have shown that with an arrangement having an elliptical cross-section of the
conical body 7 and of itsmating shape 15 an optimum utilization of the material takes place when the ellipse is aligned in its plane such that its large axis appears as a perpendicular in a projection towards lateral. Such an arrangement allows a maximum strength to be achieved for the conical clamping connection between theconical body 7 and itsmating shape 15 with a width of theshaft 5 limited from anterior to posterior. This applies to arrangements having a fullconical body 7 in accordance with FIGS. 2, 5 and 9 as well as to aconical body 7 having abore 29 in accordance with FIG. 7, as long as the shaft transverse to thelongitudinal axis 9 has a lower thickness from posterior to anterior than in other directions.
Claims (13)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01811120A EP1314407A1 (en) | 2001-11-21 | 2001-11-21 | Shoulder prothesis |
EP01811120.3 | 2001-11-21 | ||
EP02018730.8 | 2002-08-21 | ||
EP02018730.8A EP1321114B1 (en) | 2001-11-21 | 2002-08-21 | Shoulder prothesis |
Publications (2)
Publication Number | Publication Date |
---|---|
US20030097183A1 true US20030097183A1 (en) | 2003-05-22 |
US6887277B2 US6887277B2 (en) | 2005-05-03 |
Family
ID=26077441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/287,289 Expired - Lifetime US6887277B2 (en) | 2001-11-21 | 2002-11-04 | Shoulder joint prosthesis |
Country Status (2)
Country | Link |
---|---|
US (1) | US6887277B2 (en) |
EP (1) | EP1321114B1 (en) |
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Also Published As
Publication number | Publication date |
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EP1321114B1 (en) | 2018-03-07 |
EP1321114A1 (en) | 2003-06-25 |
US6887277B2 (en) | 2005-05-03 |
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